/Engine/Source/Runtime/Landscape/Classes/LandscapeSplineSegment.h
FLandscapeSplineInterpPoint ( FVector InCenter, FVector InLeft, FVector InRight, FVector InFalloffLeft, FVector InFalloffRight, FVector InLayerLeft, FVector InLayerRight, FVector InLayerFalloffLeft, FVector InLayerFalloffRight, float InStartEndFalloff )